I got this air purifier for my bedroom. My dog has a very severe dust mite allergy. He was literally disintegrating. His hair was falling out and his dandruff was like a blizzard. He had full body yeast and it smelled like a dirty gym sock on steroids. Despite having no carpet, rugs and bedding that are washed weekly, and dust mite covers on both of our beds, he was still miserable. He is so allergic that out of desperation I'm trying everything I possibly can to minimize his exposure while his immunotherapy does its job. The vet said that short of having hospital level air purification I would never get rid of all the dust mites, but I can limit his exposure with air purifiers, so we are giving it a try. There's no way I can accurately gauge how much this air purifier is reducing the dust mites, but it has to be better than it was before I got it. My dog gets 3 medicated baths a week and is about to start immunotherapy, so I can't really credit any progress to the air purifier alone, but there is no doubt it will help reduce the total number of dust mites he is exposed to. I also got a larger air purifier for my living room/kitchen. I live in a camper currently as I recently moved and am building a home. Since we live in cramped quarters with less ventilation than a sticks and bricks home, the dust mites and other allergens are far more concentrated. I've noticed since having these two purifiers running that our home smells fresher and cleaner, any smells do not linger. I've tried my hardest to deep clean any dust collected around the house in all the little nooks and crannies that you can't see and hopefully the purifiers will help keep that to a minimum. For some reason even in the dead of winter we seem to have a lot of dust. Again, probably because the space is so small. It seems the smaller the space, the bigger the mess! Thankfully it doesn't take as long to clean a smaller space. I'm not sure if I'll ever really know how effective these are, but I can say I've noticed a big difference since I got them in the quality of the air. We have wood heat so there's not a furnace constantly blowing air around. They provide air flow in what used to be pretty stagnant areas in the winter when the a/c isn't running. The stinky sock yeasty dog smell has been reduced quite a bit, and any other lingering smells like cooking or flatulence from my gassy teenager don't tend to hang around as long lol. So they have been a win-win! They seem to work very well. I don't use the timer features because I let them both run 24/7, but it's nice to have that as an option if it's ever needed. I really appreciate the small footprint of this purifier because there's not much room in a camper. I have it on my bedside table. You can see in the picture about how big it is next to my 40oz swig. Even on high it's very quiet, but I'm one of those "can't sleep without a fan" people so I enjoy the sound lol. Between this and the fan at the foot of my bed pushing air towards it, our air in the bedroom ought to be squeaky clean!